We switched carriers and I took a gamble on the V40. It's no doubt a better phone in every way, except audio.
The bass is leaner, the treble is more rolled off, and the mids are a little more recessed.
It is unfortunate to hear that the V40 is a step down from the V30 in terms of SQ. According to my experience so far with all LG V series (V10, V20, V30) - each newer model has a better sound quality. I think the V30 has the significant improvement over the V10/V20 in terms of soundstage.
Can you share please which V30 model was tested (B&O or Non-B&O)?
Thanks!